Once you get past understanding the mechanics and when to expect what, you will have the second easiest dps job other than a bard (if they are not kiting renauld's)

You want to stay motionless in the middle ring just far enough from everyone that you won't clip them with the flame circle. And basically your same rotation. I'm like only i93 on that fight and I think my dps was close to 300. Considering had bad luck with flame circles and it dropped at the end. That and I don't normally dps but I do in this fight. Just once you get used to the mechanics, your dps will shoot up.

And don't turn away as soon as you get the voice debuff. Keep attacking till it hits 3 seconds then turn away. 4 seconds is most likely two fire 1's and possible a firestarter lol.